When she was transferred into the future, Chrome’s physical condition became worse as her illusionary internal organs began failing one after the other. The adult Hibari Kyoya then instructed her to use the power of her Vongola Ring to sustain her organs through her own illusions. This allowed Chrome to escape any immediate danger, and thus prolonging her life.
Cosplayers Schoki and Hibanator make an excellent Chrome and Kyoya! I love the setting and Kyoya’s fierce attitude! Thanks to Itsuchi, their photographer as well as Miranda for the suggestion!